OP, Ive been following your threads and am in awe at your strength, organisation skills and cooking abilities. You have done an amazing job keeping calm, getting support and advice and collecting evidence before making your move, in the face of betrayal and ongoing financial abuse.
I think you are right in not doing the car drop off scheme - it might play out well in a movie and be dramatically satisfying but it could also be used to paint you as unstable, emotional and unreasonable and muddy the waters of the clarity you have found.
I think I would meet him at the house with a trusted friend/family member who can be relied on to keep to the script and stay calm: and keep it as cold as he does. Inform him you have filed for divorce due to his treatment of you and financial abuse. (Your choice if you mention you also know all about the affair and his UAE plans)
You have packed his car and work stuff for him, here are the keys, solicitor will be in touch. Other communication to this new email address where we can discuss access/contact time and coparenting our daughters, including how and when we will inform them of the changes and our divorce. Not interested in other communication or recriminations, its over, you are being more than reasonable and would now like him to leave.
I suspect others may give different advice but it might be worth mentioning if you have contacted police and forensic accountant over his financial abuse. It may stop any shenanigans to hide money/investments if he knows you have full evidence and people are onto him - eg my solicitor has a complete record of your financial situation as of x date and this will be taken into consideration during the divorce process, so any false declarations or attempts to disadvantage me and your children by concealing money/investments will be obvious.